William Willoughby, 5th Baron Willoughby de Eresby

William Willoughby, 5th Baron Willoughby de Eresby (1370-4 December 1409) was an English baron.

Biography
William Willoughby was born into an English noble family, and his family had a tradition of military service. He served principally against the Welsh and northern rebels of Henry IV of England, having joined forces with Henry soon after his landing in Ravenspur in 1399. In 1400, he took part in Henry IV's expedition into Scotland, and he was admitted to the Order of the Garter a year later. In 1402, he was appointed to negotiate with Owain Glyndwr, and he received Henry Percy's lands after fighting for Henry at the Battle of Shrewsbury in 1403. In 1405, he was also granted the lands forfeited by Henry Percy, 1st Earl of Northumberland. He died in 1409.